When I saw the bad luck stat, I instantly remembered the bad luck ring, but the effect was even more than expected. Basically, her negative luck stat was so great, that when she put on the ring of misfortune and her luck rose to ridiculous heights that the ring itself was transformed into a ring of luck. So now, not only do they have a legendary class item that can double anyone's luck any remove any of the wearer's curse, but the girl is also no longer cursed and just has huge luck without having to wear that ring. That's pretty ridiculous. That said, there isn't any reason for her to not keep that ring, as really, with her luck stat, she is the one best suited to wearing it and she can temporarily share it with anyone to remove their curses if necessary.